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磷酸化改性纤维素纳米纤丝复合聚氨酯制备pH响应性形状记忆材料
Preparation of pH-Responsive Shape Memory Composites by Phosphorylated Modified Cellulose Nanofibril and Polyurethane
收稿日期:2021-02-20  
DOI:10.11980/j.issn.0254-508X.2021.08.001
关键词:  纤维素纳米纤丝  聚氨酯  形状记忆材料  pH响应
Key Words:cellulose nanofiber  polyurethane  shape memory polymers  pH-responsive
基金项目:国家自然科学基金面上项目(31971610)。
作者单位邮编
刘佳璇 天津科技大学天津市制浆造纸重点实验室天津300457 300457
张世超 天津科技大学天津市制浆造纸重点实验室天津300457 300457
李群 天津科技大学天津市制浆造纸重点实验室天津300457 300457
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摘要:本研究通过在纤维素大分子中引入磷酸基团获得具有pH敏感性的磷酸化纤维素纳米纤丝(Phosphorylation Cellulose Nanofibril,PCNF),然后采用溶剂共混复合聚氨酯(PU)成功制备了具有pH响应能力的形状记忆材料。探究了不同PCNF接枝已内酯材料(PCNF-CL)添加量下PCNF/PU复合材料(SMPU)在酸碱条件下的形状记忆性能。结果表明,在酸碱条件下PCNF-CL与PU分子间能可逆地产生一种氢键缔合,这种作用产生不同的效果可使材料固定和回复形状;当PCNF-CL添加量为10%时,在pH值=1的条件下,该材料可以加工成临时形状,固定率为99.8%,pH值=13时又回复到初始形状,回复率达到99.5%;力学拉伸结果表明,在添加PCNF-CL后SMPU复合材料的力学强度显著提升,且在添加量为1%时拉伸强度达到最大。
Abstract:Phosphorylation of cellulose nanofibril (PCNF) with pH-sensitive was obtained by introducing phosphate groups into cellulose macromolecules. A shape memory material with pH-response was successfully prepared using solvent blending polyurethane (PU). The shape memory properties of PCNF/PU composite (SMPU) with different PCNF additions under the condition of acid and base were investigated. The results showed that under acid-base conditions, PCNF-CL and PU molecules could reversibly produce a hydrogen bond association, which produced different effects to fix and restore the shape of the material. Under the condition of pH value = 1, the material could be processed into temporary shape with a fixation rate of 99.8%. When pH value was 13, it returned to original shape, and the recovery rate reached 99.5%. The mechanical tensile results showed that the mechanical strength of the SMPU composite material was significantly increased after adding PCNF-CL, and the tensile strength reached the maximum when the addition amount was 1%.
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